Petee j



(NoModeL) P. J. HIOKBY & O F. NORRIS.

' COVER FOR MANHOLES. N 50'8,471.

Patented Nov. 14, 1893.

' UNITED STATES PETER J. HIOKEY AND CHARLES PATENT OFFICE;

:F. NoRRIs, OF NEW YoRK, N. Y.

COVERYFVQR IIVIAN'HOLIESI.

SPECIFICATION forming part of Letters Patent No. 508,471, dated November14, 1893 Application filed August 8, 1892.

To all whom it may concern:

Be it known that we, PETER J. HIoK Y and CHARLES F. NoRRIs, residing atNew York, in the county of New York and State of New York, have inventedcertain new and useful Improvements in Covers for Manholes; and we dohereby declare the-following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

Our invention relates to an improvement in covers for man-holes or sewertraps,the object being to so construct the same and the means employedfor supporting it, that it shall be firm and rigid and capable ofwithstanding any pressure which may be brought to bear thereon.

A further object is to construct the device in such manner that itcannot be tipped in case a heavy weight or pressure is brought to bearthereon at the periphery.

A further object is to produce means for covering sewer traps orman-holes, which shall be simple in construction and effectual in theperformance of their functions.

With these objects in view the invention consists in certain novelfeatures of construction and combinations and arrangements of parts ashereinafter set forth and pointed out in the claim.

In the accompanying drawings: Figure l is a perspective view of ourimprovements. Fig. 2 is a sectional view of the same. Fig. 3 is asectional view of the cover, on the line ww of Fig. 2.

A represents an annular casing having at its base a laterally projectingannular flange a, adapted to be supported by the masonry constitutingthe wall of the man-hole. The requisite rigidity of the flange arelatively to the casing A will be insured by means of a series ofbraces or ribs b. The bottom portion of the interior of the'casing A isprefer-' ably made vertical, as at c, and at the top of said verticalportion, lugs or ears (1 are located and project inwardly, said lugs orcars being arranged at diametrically opposite points. Above. thevertical portion 0 of the interior of the casing, an inclined or beveledseat 6 is made, and at the top of'the seat 6 is a shoulder f, abovewhich a flange 9 projects. The cover B is adapted to enter the casingSerial 110.442.513. (No model.)

- and is made of sufficient length to pass through the same. The coverBis made with a vertical peripheral face 71. at its bottom adapted tolie parallel with the vertical interior wall 0 of the casing and thisvertical peripheral face is provided with notches or recesses 71 throughwhich the lugs or ears (1 'pass. Above the vertical face h of the coveran annular groove j is made for the reception of the lugs or ears (1. Astop (1' is located in the groove j to limit -.the movement of said lugsor ears and prevent the cover from being turned too far. Above thegroove j the cover B is made with a beveled or inclined face is, adaptedto rest upon the beveled or inclined seat 6 and at the upper end of thebeveled or inclined face 7c is a peripheral groove Z adapted to rest onthe shoulder f, the top of the cover support on the seat e; that saidsupport or' bearing for the cover extends through the periphery thereof;that the cover is therefore capable of withstanding any pressure whichmay be brought to bear upon it, and that the top of the cover will beflush with the top of the casing. It will also be seen that as the coverextends through the casing and the vertical peripheral face of the coveris parallel with the interior vertical peripheral wall of the casing,the cover will be effectually prevented from being tipped whenan-excessive amount of weight is brought to bear upon it. The device isvery simple in construction and effectual in the performance of itsfunctions.

Having fully described our invention, What we claim as new, and desireto secure by Letters'Pate'nt, is-

In a covering for a man-hole, the combination with a casing having aninclined seat and a vertical wall below said seat, of a cover adapted topass through said casing and having an inclined peripheral face to restupon lying flush with the upper edge of the flange g,

said inclined seat and a vertical peripheral In testimony whereof wehave signed this face to lie parallel with the vertical wall ofspecification in the presence of two subscrib- 10 the casing, notches insaid vertical face of the in g Witnesses.

cover, a groove between the vertical face and PETER J. HIOKEY.

5 the inclined face of the seat, lugs on the cas- CHARLES F. NORRIS.

ing for passing through said recesses and Witnesses: adapted to enterthe groove anda stop in the H. B. KINGDON,

groove, substantially as set forth. MILLARD R. J ONES.

